From: Ingo Molnar <mingo@kernel.org>
Date: Thu, 5 Jun 2014 09:18:34 +0000 (+0200)
Subject: Merge branch 'perf/kprobes' into perf/core
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=10b0256496fd6c162478547f7c6df1e052e87644;p=openwrt%2Fstaging%2Fblogic.git

Merge branch 'perf/kprobes' into perf/core

Conflicts:
	arch/x86/kernel/traps.c

The kprobes enhancements are fully cooked, ship them upstream.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

10b0256496fd6c162478547f7c6df1e052e87644
diff --cc arch/x86/kernel/traps.c
index 3fdb20548c4b,3c8ae7d83820..461926b0577c
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@@ -137,38 -136,7 +137,38 @@@ do_trap_no_signal(struct task_struct *t
  	return -1;
  }
  
 +static siginfo_t *fill_trap_info(struct pt_regs *regs, int signr, int trapnr,
 +				siginfo_t *info)
 +{
 +	unsigned long siaddr;
 +	int sicode;
 +
 +	switch (trapnr) {
 +	default:
 +		return SEND_SIG_PRIV;
 +
 +	case X86_TRAP_DE:
 +		sicode = FPE_INTDIV;
 +		siaddr = uprobe_get_trap_addr(regs);
 +		break;
 +	case X86_TRAP_UD:
 +		sicode = ILL_ILLOPN;
 +		siaddr = uprobe_get_trap_addr(regs);
 +		break;
 +	case X86_TRAP_AC:
 +		sicode = BUS_ADRALN;
 +		siaddr = 0;
 +		break;
 +	}
 +
 +	info->si_signo = signr;
 +	info->si_errno = 0;
 +	info->si_code = sicode;
 +	info->si_addr = (void __user *)siaddr;
 +	return info;
 +}
 +
- static void __kprobes
+ static void
  do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
  	long error_code, siginfo_t *info)
  {
@@@ -200,42 -168,61 +200,43 @@@
  	}
  #endif
  
 -	if (info)
 -		force_sig_info(signr, info, tsk);
 -	else
 -		force_sig(signr, tsk);
 +	force_sig_info(signr, info ?: SEND_SIG_PRIV, tsk);
  }
+ NOKPROBE_SYMBOL(do_trap);
  
 -#define DO_ERROR(trapnr, signr, str, name)				\
 -dotraplinkage void do_##name(struct pt_regs *regs, long error_code)	\
 -{									\
 -	enum ctx_state prev_state;					\
 -									\
 -	prev_state = exception_enter();					\
 -	if (notify_die(DIE_TRAP, str, regs, error_code,			\
 -			trapnr, signr) == NOTIFY_STOP) {		\
 -		exception_exit(prev_state);				\
 -		return;							\
 -	}								\
 -	conditional_sti(regs);						\
 -	do_trap(trapnr, signr, str, regs, error_code, NULL);		\
 -	exception_exit(prev_state);					\
 +static void do_error_trap(struct pt_regs *regs, long error_code, char *str,
 +			  unsigned long trapnr, int signr)
 +{
 +	enum ctx_state prev_state = exception_enter();
 +	siginfo_t info;
 +
 +	if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=
 +			NOTIFY_STOP) {
 +		conditional_sti(regs);
 +		do_trap(trapnr, signr, str, regs, error_code,
 +			fill_trap_info(regs, signr, trapnr, &info));
 +	}
 +
 +	exception_exit(prev_state);
  }
  
 -#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr)		\
 +#define DO_ERROR(trapnr, signr, str, name)				\
  dotraplinkage void do_##name(struct pt_regs *regs, long error_code)	\
  {									\
 -	siginfo_t info;							\
 -	enum ctx_state prev_state;					\
 -									\
 -	info.si_signo = signr;						\
 -	info.si_errno = 0;						\
 -	info.si_code = sicode;						\
 -	info.si_addr = (void __user *)siaddr;				\
 -	prev_state = exception_enter();					\
 -	if (notify_die(DIE_TRAP, str, regs, error_code,			\
 -			trapnr, signr) == NOTIFY_STOP) {		\
 -		exception_exit(prev_state);				\
 -		return;							\
 -	}								\
 -	conditional_sti(regs);						\
 -	do_trap(trapnr, signr, str, regs, error_code, &info);		\
 -	exception_exit(prev_state);					\
 +	do_error_trap(regs, error_code, str, trapnr, signr);		\
  }
  
 -DO_ERROR_INFO(X86_TRAP_DE,     SIGFPE,  "divide error",			divide_error,		     FPE_INTDIV, regs->ip )
 -DO_ERROR     (X86_TRAP_OF,     SIGSEGV, "overflow",			overflow					  )
 -DO_ERROR     (X86_TRAP_BR,     SIGSEGV, "bounds",			bounds						  )
 -DO_ERROR_INFO(X86_TRAP_UD,     SIGILL,  "invalid opcode",		invalid_op,		     ILL_ILLOPN, regs->ip )
 -DO_ERROR     (X86_TRAP_OLD_MF, SIGFPE,  "coprocessor segment overrun",	coprocessor_segment_overrun			  )
 -DO_ERROR     (X86_TRAP_TS,     SIGSEGV, "invalid TSS",			invalid_TSS					  )
 -DO_ERROR     (X86_TRAP_NP,     SIGBUS,  "segment not present",		segment_not_present				  )
 +DO_ERROR(X86_TRAP_DE,     SIGFPE,  "divide error",		divide_error)
 +DO_ERROR(X86_TRAP_OF,     SIGSEGV, "overflow",			overflow)
 +DO_ERROR(X86_TRAP_BR,     SIGSEGV, "bounds",			bounds)
 +DO_ERROR(X86_TRAP_UD,     SIGILL,  "invalid opcode",		invalid_op)
 +DO_ERROR(X86_TRAP_OLD_MF, SIGFPE,  "coprocessor segment overrun",coprocessor_segment_overrun)
 +DO_ERROR(X86_TRAP_TS,     SIGSEGV, "invalid TSS",		invalid_TSS)
 +DO_ERROR(X86_TRAP_NP,     SIGBUS,  "segment not present",	segment_not_present)
  #ifdef CONFIG_X86_32
 -DO_ERROR     (X86_TRAP_SS,     SIGBUS,  "stack segment",		stack_segment					  )
 +DO_ERROR(X86_TRAP_SS,     SIGBUS,  "stack segment",		stack_segment)
  #endif
 -DO_ERROR_INFO(X86_TRAP_AC,     SIGBUS,  "alignment check",		alignment_check,	     BUS_ADRALN, 0	  )
 +DO_ERROR(X86_TRAP_AC,     SIGBUS,  "alignment check",		alignment_check)
  
  #ifdef CONFIG_X86_64
  /* Runs on IST stack */